Consider a wind turbine with a blade diameter of 250 ft. It is installed in a location where average wind velocity is 20 ft/s. The overall efficiency of the wind turbine is 35 percent. The produced electric- ity is to be used for producing hydrogen by water electrolysis with an efficiency of 85 percent. Deter- mine the rate of hydrogen production in lbm/s. Take the density of air to be 0.078 lbm/ft.